WorksheetsQuiz in Thermodynamics (Elements - Part 2)
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
At critical point the latent enthalpy of vaporization is
a)
temperature dependent
b)
maximum
c)
minimum
d)
zero
2.
What is the force which tends to draw a body toward the center about which it is rotating?
a)
Centrifugal advance
b)
Centrifugal force
c)
Centrifugal in motion
d)
Centripetal force
3.
When a system deviates infinitesimally from equilibrium at every instant of its state, it is undergoing
a)
quasi-static process
b)
cyclic process
c)
isometric process
d)
isobaric process
4.
A pressure of 1 millibar is equivalent to
a)
1000 psi
b)
1000 dynes/cm²
c)
1000 cm of Hg
d)
1000 kg/cm²
5.
Work done per unit change when charged is moved from one point to another.
a)
Potential at a point
b)
Electrostatic point
c)
Potential difference
d)
Equipotential surface
6.
How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?
a)
4
b)
1
c)
2
d)
3
7.
Which of the following relations defines enthalpy?
a)
h = pV + T
b)
h = u + p/V
c)
h = u + p/t
d)
h = u + pV
8.
Which of the following is true for water at a reference temperature where enthalpy is zero?
a)
Internal energy is negative
b)
Vapor pressure is zero
c)
Entropy is non-zero
d)
Specific volume is zero
9.
On what plane is the Mollier diagram plotted?
a)
h-s
b)
p-V
c)
h-u
d)
p-T
10.
The compressibility factor z is used for predicting the behavior of non-ideal gases. How is the compressibility factor defined relative to an ideal gas? (subscript c refers to critical value)
a)
z = P/Pc
b)
z = PV/RT
c)
z = (T/Tc)(Pc/P)
d)
z = T/Tc
11.
How is the quality x of a liquid - vapor mixture defined?
a)
The fraction of the total volume that is saturated liquid
b)
The fraction of the total mass that is saturated vapor
c)
The fraction of the total volume that is saturated vapor
d)
The fraction of the total mass that is saturated liquid
12.
What is the expression for heat of vaporization?
a)
hf
b)
hf - hg
c)
hg
d)
hg - hf
13.
What is the value of the work done for a closed reversible, isometric system?
a)
Indeterminate
b)
Zero
c)
Positive
d)
Negative
14.
What is the equation for the work done by a constant temperature system?
a)
W = MRT ln(V₂/V₁)
b)
W = mRT ln(V₂ - V₁)
c)
W = mR (T₂ - T₁) ln(V₂/V₁)
d)
W = RT ln (V₂/V₁)
15.
What is true about the polytropic exponent n for a perfect gas undergoing an isobaric process?
a)
n > 0
b)
n = ∞
c)
n = 0
d)
n < 0
16.
How does an adiabatic process compare to an isentropic process?
a)
Adiabatic: Reversible, Isentropic: Not reversible
b)
Adiabatic: Heat transfer = 0, Isentropic: Heat transfer = 0
c)
Both Heat transfer = 0; Isentropic: Reversible
d)
Adiabatic: Heat transfer = 0, Isentropic: Heat transfer = 0
17.
During an adiabatic, internally reversible process, what is true about the change in entropy?
a)
It is temperature-dependent
b)
It is always zero
c)
It is always less than zero
d)
It is always greater than zero
18.
For an irreversible process, what is true about the change of entropy of the system and the surroundings?
a)
ds = 0
b)
ds < 0
c)
ds > 0
d)
ds = dq/dt
19.
For which type of process does the equation dQ = Tds hold?
a)
Isobaric
b)
Reversible
c)
Isothermal
d)
Irreversible
20.
Which of the following is true for any process?
a)
ΔS (Surrounding) + ΔS (system) < 0
b)
ΔS (Surrounding) + ΔS (system) ≤ 0
c)
ΔS (Surrounding) + ΔS (system) ≥ 0
d)
ΔS (Surrounding) + ΔS (system) > 0
21.
Which of the following thermodynamic cycle is the most efficient?
a)
Rankine
b)
Brayton
c)
Otto
d)
Carnot
22.
The ideal reversible Carnot cycle involves four basic processes. What type of processes are they?
a)
All isentropic
b)
All isothermal
c)
Two isothermal and two isentropic
d)
All adiabatic
23.
What is the temperature difference of the cycle if the entropy difference is ΔS, and the work done is W?
a)
ΔS / W
b)
ΔS - W
c)
W / ΔS
d)
W - ΔS
24.
Which of the following is not an advantage of a super heated closed Rankine cycle over an open Rankine cycle?
a)
Increased efficiency
b)
Increased boiler life
c)
Lower equipment cost
d)
Increased turbine life
25.
Which of the following statements regarding Rankine cycle is not true?
a)
Use of a condensable vapor in the cycle increases the efficiency of the cycle
b)
Superheating increases the efficiency of a Rankine cycle
c)
In practical terms, the susceptibility of the engine materials to corrosion is not a key limitation on the operating efficiency
d)
The temperature at which energy is transferred to and from the working liquid are less separated than in a Carnot
26.
Which one of the following is standard temperature and pressure (STP)?
a)
0 K and 1 atm pressure
b)
0°C and 1 atm pressure
c)
0 F and zero pressure
d)
32 F and zero pressure
27.
A substance is oxidized when which of the following occurs?
a)
It absorb energy
b)
It gives off heat
c)
It turns red
d)
It loses electrons
28.
Which of the following is not a unit of pressure?
a)
kg/m²
b)
Pa
c)
kg/m-s
d)
bars
29.
Which of the following is the definition of Joule?
a)
Newton meter
b)
rate of change of energy
c)
kg m/s²
d)
unit of power
30.
Which of the following is the basis for Bernoulli's law for fluid flow?
a)
The principle of conservation of energy
b)
Fourier's law
c)
The continuity equation
d)
The principle of conservation of mass
31.
Equation of state for a single component can be any of the following except:
a)
the ideal gas law
b)
a mathematical expression defining a path between states
c)
any relationship interrelating 3 or more state functions
d)
relationship mathematically interrelating thermodynamics properties of the material
32.
The state of a thermodynamic system is always defined by its:
a)
temperature and pressure
b)
properties
c)
process
d)
absolute temperature
33.
In any non quasi-static thermodynamic process, the overall entropy of an isolated system will
a)
increase only
b)
decrease only
c)
increase and then decrease
d)
decrease and then increase
34.
Entropy is the measure of:
a)
the heat capacity of a substance
b)
the internal energy of a gas
c)
the randomness or disorder
d)
the change of enthalpy of a system
35.
Which of the following statements about entropy is false?
a)
Entropy of a crystal at 0 °F is zero
b)
Entropy of a mixture is greater than that of its components under the same condition
c)
An irreversible process increases entropy of the universe
d)
Net entropy change in any closed cycle is zero
36.
Work or energy can be function of all the following except:
a)
force and time
b)
temperature and entropy
c)
force and distance
d)
power and time
37.
Energy changes are represented by all except which one of the following:
a)
-∫VdP
b)
Tds - PdV
c)
mCₚdt
d)
dQ/T
38.
U + PV is a quantity called:
a)
entropy
b)
enthalpy
c)
internal energy
d)
shaft work
39.
In flow process, neglecting KE and PE changes, ∫vdP represents which item below?
a)
Closed system work
b)
Shaft work
c)
Enthalpy change
d)
Heat transfer
40.
Power may be expressed in units of
a)
Btu
b)
kW-hr
c)
ft-lb
d)
Btu/hr
41.
Equilibrium condition exist in all except which of the following?
a)
In a steady state flow process
b)
Where nothing can occur without an effect on the system's surrounding
c)
In reversible processes
d)
In processes where driving forces are infinitesimals
42.
In a closed system (with a moving boundary) which of the following represents work done during an isothermal process?
a)
W = 0
b)
W = P₁V₁ ln (V₂/V₁)
c)
W = P(V₂ - V₁)
d)
W = (P₂V₂ - P₁V₁)/(1 - n)
43.
A substance that exists, or is regarded as existing, as a continuoum characterized by a low resistance to flow and the tendency to assume the shape of its container.
a)
Molecule
b)
Fluid
c)
Vapor
d)
Atom
44.
A substance that is homogeneous in a composition and homogeneous and invariable in chemical aggregation.
a)
Vapor
b)
Simple substance
c)
Water
d)
Pure substance
45.
A substance whose state is defined by variable intensive thermodynamic properties.
a)
Pure substance
b)
Vapor
c)
Water
d)
Simple substance
46.
A system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries.
a)
Isolated system
b)
Nonflow system
c)
Closed system
d)
Open system
47.
A system that is completely impervious to its surrounding or neither mass or energy cross its boundaries
a)
Closed system
b)
Open system
c)
Nonflow system
d)
Isolated system
48.
A system in which there is a flow of mass across its boundaries.
a)
Closed system
b)
Steady flow system
c)
Isolated system
d)
Open system
49.
The properties that are dependent upon the mass of the system and are total values such as total volume and total internal energy.
a)
Extensive properties
b)
State properties
c)
Intensive properties
d)
Specific properties
50.
The properties that are independent of the mass of the system such as temperature, pressure, density and voltage.
a)
Intensive properties
b)
Specific properties
c)
Extensive properties
d)
State properties
100 %
